<template>
  <div class="list" ref="wrapper">
    <div ref="content">
      <!--当前城市-->
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <router-link to="/">
            <div class="button-wrapper" re>
              <div class="button">{{city}}</div>
            </div>
          </router-link>
        </div>
      </div>
      <!--热门城市-->
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list">
          <div
            v-for="item of hotCities"
            :key="item.id"
            class="button-wrapper"
            @click="handleCityClick(item.name)"
          >
            <div class="button">{{ item.name }}</div>
          </div>
        </div>
      </div>
      <!--字母选择城市-->
      <div class="area" v-for="(item, key) in cities" :key="key" :ref="key">
        <div class="title border-topbottom">{{ key }}</div>
        <div class="item-list">
          <div class="item border-bottom"
               v-for="item2 in item"
               :key="item2.id"
               @click="handleCityClick(item2.name)"
          >
            {{ item2.name }}
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script>
import Bscroll from 'better-scroll'
import { mapState } from 'vuex'

export default {
  name: 'List',
  props: {
    cities: Object,
    hotCities: Array,
    letter: String
  },
  data() {
    return {
      scroll: null
    }
  },
  methods: {
    handleCityClick(city) {
      // alert(city)
      this.$store.dispatch('changeCity', city)
      this.$router.push('/')
    }
  },
  computed: {
    ...mapState(['city'])
  },
  watch: {
    cities(e) {
      // 下次更新DOM 执行的代码
      this.$nextTick(function() {
        // 初始化 better-scrool
        this.scroll = new Bscroll(this.$refs.wrapper)
      })
    },
    letter() {
      if (this.letter) {
        const element = this.$refs[this.letter][0]
        this.scroll.scrollToElement(element, 500)
      }
    }
  }
}
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color: #ccc

    &:after
      border-color: #ccc

  .border-bottom
    &:before
      border-color: #ccc

  .list
    overflow: hidden
    position: absolute
    top: 1.58rem
    left: 0
    right: 0
    bottom: 0

    .title
      line-height: .54rem
      background: #eee
      padding-left: .2rem
      color: #666
      font-size: .26rem

    .button-list
      overflow: hidden
      padding: .1rem .6rem .1rem .1rem

      .button-wrapper
        float: left
        width: 33.33%

        .button
          margin: .1rem
          padding: .1rem 0
          text-align: center
          border: .02rem solid #ccc
          border-radius: .06rem

    .item-list
      .item
        line-height: .76rem
        padding-left: .2rem
</style>
